ACI AGGREGATE BASE TESTING TECHNICIAN
QUESTIONS
(D75) Sampling should be done very carefully because it is as important as _____. -
Answers :Testing
The _____ or _____ should obtain samples related to the control of production at the
source or related to the control of the work at the site. - Answers :Manufacturers,
contractors
Samples to be tested for quality should, when possible, be obtained from the _____. -
Answers :Finished product
(D75) Sampling containers for aggregate samples should be made so that the contents
will not be lost, ____ or ___. - Answers :Contaminated or damaged
The reason it is difficult to obtain unbiased samples from stockpiles is because coarse
and fine particles become segregated. True or False? - Answers :True
____ can help in obtaining accurate samples from stockpiles. - Answers :Power
equipment
(D75)What are the four sources from which field samples can be obtained? - Answers
:Conveyer belts
Transport units
Roadways
Stockpiles
Not using correct procedures for reducing samples to testing size can result in a _____.
- Answers :Nonrepresentative sample
T or F
Generally, small samples are most representative of the total supply. - Answers :False
T or F
There are some instances in which differences between test samples can't be avoided. -
Answers :True
What determines whether large-size particles are equally distributed among test
samples that have been reduced? - Answers :Laws of chance
Which method of reducing a sample must be used with fine, dry aggregate? (C702) -
Answers :Method A, mechanical splitter
, What must be done to the sample if method B or C is used? (C702) - Answers :Moisten
the sample
What do you do if the sample is wet and Method A is to be used? (C702) - Answers :Dry
the sample
Method C, miniature stockpiling, cannot be used for which type of aggregate? (C702) -
Answers :Coarse aggregate, or mixtures of coarse and fine aggregate
Which method involves the use of chutes, holding receptacles, and hoppers or straight-
edged pans? (C702) - Answers :Method A
Sample splitters must have how many equal width chutes for coarse aggregate? (C702)
- Answers :8
Sample splitters must have how many equal width chutes for fine aggregate? (C702) -
Answers :12
In Methods B and C the sample is shoveled into a ____ before it is flattened and
divided. (c702) - Answers :conical pile
When using Method B, what is an alternate surface that can be used when reducing the
sample? (C702) - Answers :Canvas blanket or tear resistant tarp
When quartering a sample, retain two _________ quarters and reject the other two.
(c702) - Answers :diagonally opposite
In miniature stockpile sampling, obtain the sample by selecting at least ____ increments
of material from ____ locations in the stockpile. (C702) - Answers :5, random
The drying apparatus used for dry preparation of a sample is any suitable device
capable of drying samples at a temperature not exceeding _____. (D421) - Answers
:60*C/140*F
A suitable sample splitter is one capable of obtaining ____ portions of the sample
without appreciable loss of ____. (D421) - Answers :representative, fines
For particle size analysis, material passing a 2.00mm (No. 10) sieve is required in
amounts equal to approximately ___ g for sandy soils and approximately ___g for silty
or clayey soils. (D421) - Answers :110, 60
For specific gravity, material passing a 2.00mm (10) sieve is requires in amounts of at
least ____g when the volumetric flask is used and at least ____g when the stoppered
bottle is used. (D421) - Answers :25, 10
QUESTIONS
(D75) Sampling should be done very carefully because it is as important as _____. -
Answers :Testing
The _____ or _____ should obtain samples related to the control of production at the
source or related to the control of the work at the site. - Answers :Manufacturers,
contractors
Samples to be tested for quality should, when possible, be obtained from the _____. -
Answers :Finished product
(D75) Sampling containers for aggregate samples should be made so that the contents
will not be lost, ____ or ___. - Answers :Contaminated or damaged
The reason it is difficult to obtain unbiased samples from stockpiles is because coarse
and fine particles become segregated. True or False? - Answers :True
____ can help in obtaining accurate samples from stockpiles. - Answers :Power
equipment
(D75)What are the four sources from which field samples can be obtained? - Answers
:Conveyer belts
Transport units
Roadways
Stockpiles
Not using correct procedures for reducing samples to testing size can result in a _____.
- Answers :Nonrepresentative sample
T or F
Generally, small samples are most representative of the total supply. - Answers :False
T or F
There are some instances in which differences between test samples can't be avoided. -
Answers :True
What determines whether large-size particles are equally distributed among test
samples that have been reduced? - Answers :Laws of chance
Which method of reducing a sample must be used with fine, dry aggregate? (C702) -
Answers :Method A, mechanical splitter
, What must be done to the sample if method B or C is used? (C702) - Answers :Moisten
the sample
What do you do if the sample is wet and Method A is to be used? (C702) - Answers :Dry
the sample
Method C, miniature stockpiling, cannot be used for which type of aggregate? (C702) -
Answers :Coarse aggregate, or mixtures of coarse and fine aggregate
Which method involves the use of chutes, holding receptacles, and hoppers or straight-
edged pans? (C702) - Answers :Method A
Sample splitters must have how many equal width chutes for coarse aggregate? (C702)
- Answers :8
Sample splitters must have how many equal width chutes for fine aggregate? (C702) -
Answers :12
In Methods B and C the sample is shoveled into a ____ before it is flattened and
divided. (c702) - Answers :conical pile
When using Method B, what is an alternate surface that can be used when reducing the
sample? (C702) - Answers :Canvas blanket or tear resistant tarp
When quartering a sample, retain two _________ quarters and reject the other two.
(c702) - Answers :diagonally opposite
In miniature stockpile sampling, obtain the sample by selecting at least ____ increments
of material from ____ locations in the stockpile. (C702) - Answers :5, random
The drying apparatus used for dry preparation of a sample is any suitable device
capable of drying samples at a temperature not exceeding _____. (D421) - Answers
:60*C/140*F
A suitable sample splitter is one capable of obtaining ____ portions of the sample
without appreciable loss of ____. (D421) - Answers :representative, fines
For particle size analysis, material passing a 2.00mm (No. 10) sieve is required in
amounts equal to approximately ___ g for sandy soils and approximately ___g for silty
or clayey soils. (D421) - Answers :110, 60
For specific gravity, material passing a 2.00mm (10) sieve is requires in amounts of at
least ____g when the volumetric flask is used and at least ____g when the stoppered
bottle is used. (D421) - Answers :25, 10
